Warning: Do not install the 7.0.4 update for QuickTime in Software Update. Apple released it, and then pulled it with no explanation. However, there are reports on the net that state that 7.0.4 causes problems with Windows Media files.
The QuickTime 7.0.4 update is back again. Again, no explanation.
One error is that if you close a Safari webpage with an embedded WMV file played through QuickTime 7.0.4 and Flip4Mac 2.0, Safari would crash. However, Flip4Mac 2.0.1 has now been released, which corrects this problem.